Question

3 in the diagram: name a plane parallel to plane stu.

Explanation:

In a three - dimensional figure (like a prism or a box - like structure), parallel planes are those that do not intersect and are oriented in the same way. Looking at the diagram, plane \(STU\) and plane \(WXY\) (or plane \(ZYXW\) depending on the labeling, but more likely plane \(WXY\) or plane \(ZYX\) - wait, from the vertices, plane \(STU\) has vertices \(S\), \(T\), \(U\) and a parallel plane would be plane \(WXY\) (with vertices \(W\), \(X\), \(Y\)) as they are on opposite faces of the prism - like structure and do not intersect. Another possible one is plane \(ZYX\) but more accurately, in the given diagram (assuming it's a rectangular prism - like figure), plane \(STU\) is parallel to plane \(WXY\) (or plane \(ZYXW\) but the standard parallel plane here would be plane \(WXY\) or plane \(ZYX\) - but the most appropriate is plane \(WXY\) or plane \(ZYX\)? Wait, actually, looking at the vertices: \(S\), \(T\), \(U\), \(V\) (wait, maybe the labels are \(S\), \(T\), \(U\), \(V\) and \(W\), \(X\), \(Y\), \(Z\)). So plane \(STU\) (or \(STUV\)) is parallel to plane \(WXY\) (or \(WXYZ\)). So a plane parallel to plane \(STU\) is plane \(WXY\) (or plane \(ZYXW\) or plane \(XYZ\) - but the correct one from the diagram's labeling, likely plane \(WXY\) or plane \(ZYX\). Wait, the standard answer for such a diagram (a rectangular prism) is that plane \(STU\) is parallel to plane \(WXY\) (or plane \(ZYXW\)). So the plane parallel to \(STU\) is plane \(WXY\) (or plane \(XYZ\) or plane \(ZYX\) - but the most probable is plane \(WXY\) or plane \(ZYXW\), but in the diagram, the top face relative to \(STU\) (the bottom face) would be plane \(WXY\) (or \(ZYX\)). So the answer is plane \(WXY\) (or plane \(ZYXW\), but more precisely, plane \(WXY\)).

Answer:

Plane \(WXY\) (or Plane \(ZYXW\), or other equivalent parallel plane based on the diagram's exact labeling, but commonly Plane \(WXY\))